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23 June 2021 | Story Leonie Bolleurs | Photo Supplied
The Department of Engineering Sciences (EnSci) – under the leadership of Dr Abdolhossein Naghizadeh – is heading a collaboration of scientists to create a green concrete that will reduce the impact of cement on the environment.

Conventional cement production is responsible for more than 6% of the overall carbon emissions in the world, which ultimately affects global warming.

The Department of Engineering Sciences (EnSci) at the University of the Free State (UFS) – under the leadership of Dr Abdolhossein Naghizadeh – is heading a collaboration of scientists from universities in South Africa and abroad to create a green concrete that will reduce the impact of cement on the environment.

This product has the potential to be used as an alternative to conventional concrete in large-scale constructions such as residential buildings and infrastructure, as well as small-scale constructions such a pavements and brickworks. 

Dr Nagizadeh, whose passion is cement and green concrete, says the idea of eco-friendly concrete was considered by European researchers a few years ago; however, this technology is still in its initial stages and has not been researched and employed at industrial scale yet. He believes that it is due to the complexity of the preparation process, and the relatively aggressive chemicals used in green concrete mixtures.

Expertise and equipment 

With his knowledge and experience of the product, Dr Naghizadeh – who joined EnSci in 2020 – has been appointed project leader of a collaborative group of scientists from the Universities of Johannesburg, KwaZulu-Natal, Yaoundé in Cameroon, and the Erzurum Technical University in Turkey.  

“Since there are only a limited number of researchers in this field, EnSci is benefiting from the expertise of this international collaboration. The proficiency of this group of scientists are keeping the project current, based on the latest findings in the research area,” says Louis Lagrange, Head of the Department of Engineering Sciences. 

Based on this new capacity, the department decided to establish and equip a new laboratory facility dedicated to cement and concrete research, with a specific current focus on green concrete. 

In this laboratory, they want to create formulations of green concrete, based on user-friendly materials. Furthermore, they aim to simplify the preparation and mixing process. “This can introduce a more eco-friendly, desirable product that can easily be employed extensively in the construction industry,” says Lagrange.

Benefits and other advantages

Besides its ability to reduce the impact on the environment through reduced carbon emissions, the product is also described to perform at equal or even superior strength and durability compared to conventional concrete, with potentially substantial environmental and economic benefits. 

This product is also primarily made from waste materials or industrial by-products. Dr Naghizadeh explains it as follows: “Normal concrete consists of conventional (Portland) cement, sand, stone and water, while in green concrete the conventional cement part of the concrete mix is replaced by industrial wastes or by-products and alkali solutions. These alternative materials are mostly aluminosilicate materials such as fly ash (residue from coal burning process in power plants) and slag (waste material from iron extraction processes).”

“Using these waste substances as binding material in green concrete can, apart from the environmental benefits, also reduce waste and contribute to the circular economy. Annually, more than 36 million tons of fly ash are produced in South Africa alone, of which more than 90% is deposited at landfill sites. Reuse of these waste materials will moderate the related waste deposition issues, such as air and groundwater pollution.”

Production of green concrete

Currently, green concrete is mostly produced in two parts: a solid raw material and an alkali activation solution. With their project, the research group wants to develop green concrete in a powdered form, to be mixed with water, instead of a chemical. Dr Nagizadeh estimates that the construction industry will be able to benefit from their work in about two years’ time when they will have a user-friendly green concrete product ready. 

Apart from putting an eco-friendlier concrete on the market, this project is also establishing a brand-new research niche in the UFS Department of Engineering Sciences. According to Lagrange, this research has the ability to attract postgraduate students and other researchers. He is also looking forward to the international academic recognition that EnSci will receive through published articles in leading international journals, and the participation of researchers in accredited conferences arising from this project. 

Lagrange is pleased that the project is establishing EnSci as a research player of note in the engineering field, specifically in the green engineering field. 

News Archive

Researcher finds ways to serve justice efficiently
2016-01-07

Description: Prof Monwabisi Ralarala  Tags: Prof Monwabisi Ralarala

Prof Monwabisi Ralarala tackled the serving of justice from a linguistic viewpoint.
Photo: Supplied

In 2012, local and international media was saturated with reports of the Eugène Terre’Blanche murder trial. At the judgment, Judge John Horn read a lengthy extensive document, of which three pages were dedicated to voicing his concern about how police officers distort statements in the process of translation. Considering the fact that statements are the entry points to the criminal justice system, Prof Monwabisi Ralarala’s attention was drawn to the negative impact such distortion had insofar as the administration of justice was concerned. Of the three PhD degrees conferred by the University of the Free State (UFS) Faculty of Humanities at the 2015 Summer Graduation, one was in Language Practice with Prof Ralarala’s name on it.

Prof Ralarala’s research interests in language rights, forensic linguistics, and translation studies led him to use the Terre’Blanche trial as the basis for his second PhD case study titled: Implications and explications of police translation of complainants' sworn statements: evidence lost in translation. The doctoral dissertation focused on police stations in the Xhosa-speaking community of Khayelitsha in Cape Town.

Language and the law

When the victim of a crime approaches the South African Police Services (SAPS), the requirements are that a sworn statement be taken. However, as a prerequisite, the narration needs to be translated into English.  “The process unfolds in this manner: the complainant or the person laying the charges speaks in a language that they understand, and then the police officers translate that information into English because English is still the de facto language of record,” explained Prof Ralarala.

In the process of translation, the original narrative is lost, and so is some of the evidence. “They [the statements] have to be packaged in a certain way, in the form of a summary. As a police officer, you have to discard all the original narrative and create another narrative which is in English,” added the Associate Professor and Institutional Language Coordinator at the Cape Peninsula University of Technology.

Evidence is the basis of any court case and, when it is translated by police officers who do not hold the credentials of professional translators, a problem inevitably arises.

Because police officers are not trained in translation, “Some of the statements are filled with distortions, changing of information all together. In some cases, one would come across a case which was initially an assault but then - through the change and transformation, re-narration, retelling of the story by someone else - it becomes a case of attempted murder.”

Considering that a statement determines a suspect’s fate, it becomes all the more important to ensure that accuracy is upheld.

His internal and external supervisors, Prof Kobus Marais and Prof Russel Kaschula from the UFS and Rhodes University respectively stated that his PhD work has been hailed as a gem by international scholars. “According to one international assessor, he has made an exceptional contribution to the humanities and social sciences in general and to the fields of linguistics and translation studies in particular.”

Reshaping the landscape

According to Prof Ralarala, there are huge gaps in the translated versions of statements which create a problem when a ruling is made. Some of the recommendations put forward in his dissertation to bridge that gap are:

• to review the language policy insofar as the criminal justice system is concerned. The languages we speak are official and constitutionally embraced, and they hold the same status as English, hence they need to be used in criminal justice processes;
• to revisit the constitution and review if the provisions made for the Nguni languages are implemented;
• to supplement paper and pen with technology such as tape recorders. Statements can be revisited in cases where a controversy arises;
• to deploy professional translators and interpreters at police stations;
• to design a manual for police officers which contains all the techniques on how a statement should be taken.
• to enforce constitutional  provisions in order to reinforce the language implementation plan in as far as African languages are concerned .

These recommendations serve to undo or eliminate any perceived injustices perpetuated and institutionalised by current linguistic and formal practices in South Africa's criminal justice system.

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